You can annotate the non-isometric views in 2D drawings with geometries. Currently, the app supports the following geometry types:

• 2-point centerline
• 2-line centerline
• 2-point circular centerline
• 3-point circular centerline
• Center mark
• Intersection mark

Centerline

Centerlines are dashed lines that run between two reference points or lines. You can use them in 2D drawings to: 

• Show the axes of circular or cylindrical features such as holes and discs
• Dimension circular features
• Point out features that share the same central axis

Note that in the app, you cannot dimension these centerlines with the Line length tool.

To add a centerline, follow these steps: 

1. Select Geometries in the menu.  
2. Select one of the geometry tools: 2-Point Centerline, 2-Line Centerline, 3-Point Circular Centerline, or 3-Point Centerline.  
   
   
3. If you chose 2-Point Centerline or 2-Point Circular Centerline, select two points as reference in the drawing.
   

   2-Point Centerline

   2-Point Circular Centerline

   
   If you chose 3-Point Circular Centerline, select three points on a circumference. 
   
   If you chose 2-Line Centerline, select two linear lines as reference in the drawing.
   A centerline will be created between the reference points or lines. 
4. You can extend the centerlines by dragging the arrows.
5. Select Done to exit the tool and finalize the geometries.

Center mark

Center marks are cross-shaped annotations that indicate the centers of circles, arcs, and circular edges. You can also mark these centers as reference points for dimensioning. 

To add a center mark, follow these steps: 

1. Go to Geometries > Center Mark in the menu. 
2. Select the center of circular edges.
3. Select Done to exit the tool and finalize the geometries.

Intersection mark

Intersection marks are cross-shaped annotations that indicate where two non-parallel, linear lines intersect. You can also mark these points as reference for dimensioning. 

To add an intersection mark, follow these steps: 

1. Go to Geometries > Intersection Mark in the menu. 
2. Select two linear lines that are not parallel. 
   
3. Select Done to exit the tool and finalize the geometries.